Person:
Lunar Hernández, María Del Rosario

First Name

María Del Rosario

Last Name

Lunar Hernández

URI

https://hdl.handle.net/20.500.14352/75241

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Mineralogía y Petrología

Area

Cristalografía y Mineralogía

Identifiers

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Now showing 1 - 10 of 11

The role of crustal contamination in the genesis of Ni-Cu sulfide ores from the Cortegana Igneous Complex (SW Spain)
(Let's Talk Ore Deposits: Proceedings of the Eleventh Biennial SGA Meeting, Antofagasta, Chile, 26-29 September 2011, 2011) Piña García, Rubén; Gervilla, Fernando; Ortega Menor, Lorena; Lunar Hernández, María Del Rosario
Crustal contamination of mafic magmas with S-rich country rocks is believed to play a critical role in the formation of Ni-Cu sulfide ores in SW Spain. Whereas this process has been well recognized in the Aguablanca Ni-Cu deposit (the only economic ore of this type in SW Europe), no data existed in other less mineralized, mafic-ultramafic intrusions of the region, such as the Tejadillas prospect in the Cortegana Igneous Complex. The Tejadillas prospect is composed of igneous cumulates similar to those of Aguablanca, but their incompatible trace element abundances show more primitive patterns than those of Aguablanca. In contrast, incompatible trace element ratios of the Aguablanca rocks are much closer to the contaminant country rocks than those of Tejadillas. Therefore, we suggest that the small volume of sulfide mineralization observed at Tejadillas was the consequence of low degrees of contamination of its parental magma by S-rich country rocks. This suggest that assimilation of S-rich country rocks by mafic magmas is the key factor for the genesis of economic Ni-Cu sulfide ores in SW Spain.
Edades de cristalización U-Pb en circones del complejo ígneo de Santa Olalla de Cala: implicaciones en la edad del yacimiento d e Ni-Cu-EGP de Aguablanca (Badajoz)
(Macla, 2004) Rombo, I.; Lunar Hernández, María Del Rosario; Capote Del Villar, Ramón; Quesada, C.; Dunning, G. R.; Piña García, Rubén; Ortega Menor, Lorena; Sociedad Española de Mineralogía
Origen de los fragmentos máficos-ultramáficos de la brecha mineralizada del yacimiento de Ni-Cu-EGP de Aguablanca (Badajoz)
(Macla, 2004) Piña García, Rubén; Lunar Hernández, María Del Rosario; Ortega Menor, Lorena; Gervilla, F.; Alapieti, T.; Martínez, C.
Detachment faulting and late Paleozoic epithermal Ag-basemetal mineralization in the Spanish central system
(Geology, 1988) Doblas Lavigne, Miguel Manuel Delas; Oyarzun Muñoz, Roberto; Lunar Hernández, María Del Rosario; Mayor, Nicolás; Martínez, Jesus
Hydrothermal activity during late Hercynian time resulted in epithermal silver-base-metal (Pb-Zn-Cu) vein formation in the eastern part of the Spanish central system. During the Hercynian orogeny, the central Iberian crust was thickened by compressional tectonics, heated, weakened, and subsequently overthickened by massive late Hercynian granitic intrusions. Subsequently, the central Iberian crustal welt underwent extensional collapse through lithosphere-scale, low-angle detachment faulting. The detachment systems evolved through tectonic denudation, isostatic rebound, and upward arching to define an extensional province much like the U.S. Basin and Range. Andesitic volcanism and hydrothermal activity occurred during extension, inducing epithermal-type hydrothermal convecting systems that leached, transported, and precipitated silver and base metals along fractures crosscutting the Hiendelaencina Metamorphic core complex.
Mineralogía de los yacimientos de Buen Consejo y Los Blancos. Sierra de Cartagena. Murcia
(Boletín de la Sociedad Española de Mineralogía, 1981) López García, José Ángel; Lunar Hernández, María Del Rosario
En el presente trabajo se describen la paragénesis que aparecen en los yacimientos de Buen Consejo y Los blancos, dentro de la Sierra de Cartagena, en la provincia de Murcia. La paragénesis de ambos yacimientos es muy similar, estando formada por pirita, marcasita, esfalerita, goethita y lepidocrocíta como minerales principales, y calcopirita, pirrotina, arsenopirita, boulangerita, tetraedrita y covellina como minerales accesorios. Se estudian las texturas que presentan estos yacimientos, por la incidencia que tienen en el tratamiento industrial, así como los minerales portadores de la plata.
Jarosite: A silver bearing mineral of the gossan of Rio Tinto (Huelva) and La Union (Cartagena, Spain)
(Mineralium Deposita, 1981) Amorós, José Luis; Lunar Hernández, María Del Rosario; Tavira, P.
The mineralogy of the gossans of Rio Tinto and La Unión is studied. Special emphasis has been paid to the occurrence of jarosite group minerals because they constitute silver bearing material of technical importance. After granulometric separation of the fractions, magnetic separation was used to concentrate the jarosite-group minerals. Plumbojarosite, natrojarosite and argentojarosite were identified by X-ray diffraction techniques. The spatial deposition of jarosite, goethite and hematites has been studied in different samples and the sequence interpreted on the basis of the known literature. The silver content, as determined by SEM, indicates abundant silver deposition in an early phase of gossanization. The recovery in the industrial plant has been analyzed comparing the mineralogy of the whole one and the residues of flotation. This study reveals that the industrial process used today leaves unaltered the proportion of the jarosite minerals entering and leaving the plant.
Mineralogía espacial: de la materia primigenia a la exploración de Marte
(Macla, 2004) Martínez Díaz, José Jesús; Rull, Fernando; Lunar Hernández, María Del Rosario
Fe-Mn nodules associated with hydrocarbon seeps: A new discovery in the Gulf of Cadiz (eastern central Atlantic)
(Episodes, 2007) González Sanz, Francisco Javier; Somoza Losada, Luis; Lunar Hernández, María Del Rosario; Martínez Frías, Jesús; Martín Rubí, Juan Antonio; Torres, T.; Ortiz Menéndez, José Eugenio; Díaz del Río, Víctor
The Gulf of Cadiz is situated geologically at the Gibraltar Arc, the westernmost arc of the Alpine- Himalayan orogenic belt. Based on extensive previous studies that include swath bathymetry, multi-channel and very high-resolution seismic reflection, gravimetry, magnetism, heat flow probes, and underwater photography surveys, more than 500 polymetallic nodules were collected at water depths ranging from 850 to 1000 m, associated with hydrocarbon-derived carbonate chimneys, slabs, and crusts. Nodules show a wide range of sizes, densities, weights and morphologies. Nodules are composed of multiple millimetre- thick layers of Fe and Mn oxyhydroxides surrounding a nucleus composed of Early-Middle Miocene plastic marls, which were expulsed from underlying units by fluid venting. Nodules show a high mean abundance of Fe (39.03%), moderate Mn (5.84%), and low contents of trace metals and REEs compared to the average content of deep-sea polymetallic nodules. They display fast growth rates (av. 2,500 mm Myr-1) which are probably the main cause for the low contents of transition metals. The oxide layers contain both bacterial-derived hydrocarbons and aromatic hydrocarbons such as phenanthrene, characteristic of mature hydrocarbons. We propose both diagenetic and hydrogenous processes for nodule, beneath and on the seabed, as consequence of alternating episodes of burial and exhumation. Diagenetic processes beneath the seabed are fuelled by deep-seated hydrocarbon seeps probably through microbial-mediated anaerobic oxidation of hydrocarbons. On the other hand, hydrogenous nodule growth on the seafloor is controlled by mineral precipitation from the Mediterranean Outflow Waters.
Estudio mineralógico y metalogénico del yacimiento de plomo de «El Borracho» (Badajoz)
(Acta geológica hispánica, 1979) Lunar Hernández, María Del Rosario; Vindel Catena, Elena; Sierra López, Josefina
In this paper mineralogic and metallogenic characteristics of lead silver Borracho deposit. which is located in the limit of Ciudad Real and Badajoz provinces, are studied. Galena. pyrita, chalcopyrite. bravoite and tetrahedrite are hypogenic minerals. Marcasite and cerusite are supergenic minerals and quartz. baryte and carbonates are gangue minerals. The paragenetic scheme and the mineral sequence of the deposit are given. The hydrothemal origin of the mineralization and its relation with the Valle de Alcudia deposits are proposed.
Podiform chromitites from the Calzadilla de los Barros serpentinite, Iberian Massif, SW Spain
(2011) Lunar Hernández, María Del Rosario; Ortega Menor, Lorena; Piña García, Rubén; Gervilla, Fernando; Monterrubio, Serafín; Merinero, Raúl
Podiform chromitites occur as in situ and removed bodies in the Calzadilla de los Barros Serpentinite (Iberian Massif, SW Spain), a set of ultramafic massifs made up of partly serpentinized harzburgite with minor dunite and gabbros. They consist of massive to semi-massive chromitites, frequently with nodular texture. Chromite chemistry is characterized by high Al2O3 contents and up to 0.4 wt.% TiO2, in agreement with a MORB affinity of the parental melt. Platinum-group element abundances are similar to most Al-chromitites reported in the literature except for an unusual enrichment in Pt and Pd. High Pt and Pd values were probably caused by late metamorphic alteration.